diff --git a/server/website/website/tasks/async_tasks.py b/server/website/website/tasks/async_tasks.py
index d18c9c0..7c49e55 100644
--- a/server/website/website/tasks/async_tasks.py
+++ b/server/website/website/tasks/async_tasks.py
@@ -142,7 +142,7 @@ def clean_knob_data(knob_matrix, knob_labels, session):
 
 
 @task(base=AggregateTargetResults, name='aggregate_target_results')
-def aggregate_target_results(result_id, algorithm='gpr'):
+def aggregate_target_results(result_id, algorithm):
     # Check that we've completed the background tasks at least once. We need
     # this data in order to make a configuration recommendation (until we
     # implement a sampling technique to generate new training data).